Diodes Incorporated PI3USB4000D

Overview

PI3USB4000D from Diodes Incorporated is a 2:1 differential USB 2.0 multiplexer/demultiplexer switch with 1 GHz bandwidth, 5 Ω typical on-resistance, 7 pF on-capacitance, and integrated over-voltage protection (OVP) triggering at 4.75 V. It supports bidirectional high-speed data switching between a common port (C0+/C0−) and two differential channels (L0+/L0− or L1+/L1−), enabling USB-C and MHL signal routing in smartphones and tablets.

For engineers reviewing the PI3USB4000D datasheet, PI3USB4000D pinout, PI3USB4000D application, or PI3USB4000D equivalent, key selection criteria include its 24 V tolerance on C0+/C0− pins, 1.8 V logic-compatible control inputs (SEL/EN), ultra-low propagation delay (250 ps typ), and OVP-triggered channel disable for system-level surge resilience in USB charging interfaces.

Technical Context

The PI3USB4000D implements a fully differential analog switch architecture with independent charge-pump-assisted OVP detection on C0+/C0− pins, activating within 0.5–1 µs when voltage exceeds 4.75 V. Its internal reference (REF) pin requires a 1 µF/25 V capacitor to ground to stabilize OVP threshold accuracy and noise immunity.

Control logic uses active-high EN for power-down mode (reducing leakage to 1–2 µA) and single-bit SEL to select channel routing (L0 or L1). All I/O pins tolerate up to 24 V (C0±), 6 V (Lx±), and 6 V (VDD), enabling robust integration into mixed-voltage USB-C docking and fast-charging systems without external level shifters or clamps.

Key Specifications

Pinout & Package

PI3USB4000D is housed in a 10-contact UQFN (ZUA) package measuring 1.5 mm × 2.0 mm with 0.6 mm pitch and 0.5 mm height. The thermally enhanced, lead-free, RoHS-compliant package supports high-density PCB layouts and automated reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 2.0 differential mux applications.

Compared with TS3USB30E and MAX14533, the PI3USB4000D uniquely combines 1 GHz bandwidth, 24 V C0± tolerance, and sub-µs OVP response-enabling single-chip USB-C signal routing with built-in surge resilience, whereas alternatives require supplemental protection and suffer higher insertion loss or skew.

Availability

PI3USB4000D is available at Aetrix Electronics and suitable for smartphone docking, tablet multi-protocol switching, and notebook USB-C expansion hubs requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability documentation.

Supply support for PI3USB4000D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design centers in Asia, Europe, and the US, and manufacturing in ISO/TS 16949-certified facilities.

The PI3USB4000D belongs to Diodes' high-speed analog switch product line, engineered specifically for USB-C interface protection and signal routing in mobile and portable electronics with stringent voltage tolerance and timing requirements.

FAQ

What is the purpose of the REF pin, and how must it be connected?

The REF pin provides the internal reference voltage for the over-voltage protection (OVP) comparator. It must be decoupled to GND using a 1 µF ceramic capacitor rated for ≥25 V. This capacitor stabilizes the 4.75 V OVP threshold and suppresses noise-induced false triggering. Placement must be within 2 mm of the REF and GND pins per layout guidelines in DS41992.

Does PI3USB4000D support USB 2.0 High-Speed (480 Mbps) without signal degradation?

Yes. With 1 GHz bandwidth, –0.5 dB insertion loss at 240 MHz, –35 dB crosstalk, and <20 ps differential skew, the PI3USB4000D maintains USB 2.0 eye diagram compliance per USB-IF specifications. Measured eye opening exceeds 60% vertical margin at 480 Mbps, confirming full High-Speed signal integrity retention.

How does the OVP feature behave during a 20 V USB PD event?

When C0+ or C0− rises above 4.75 V, the OVP circuit disables both switch channels within 0.5–1 µs, isolating L0/L1 from the overvoltage source. During OVP, leakage remains ≤1 mA, and the device draws only 35 µA. Channels automatically restore after C0± falls below 4.6 V, with 100 µs enable time.

Can SEL and EN be driven directly from a 1.8 V FPGA GPIO?

Yes. SEL and EN accept 1.8 V logic levels: VIH is guaranteed ≥1.2 V and VIL ≤0.6 V across the full 2.7–5.5 V VDD range. No level shifter is needed. Input leakage is ±1 µA, and input capacitance is 5 pF, ensuring clean, low-power interfacing with modern low-voltage SoCs and FPGAs.